The instrument is a teaching tool for studying the statistical laws of random phenomenon models and distributions to explain the movement rate of gas molecules. A great tool for physics lab equipment, or as a decoration for your lab, allowing you to learn physics experiments efficiently. With this instrument, statistical tools are used to explain the statistical laws of velocity distribution using gas molecules. The instrument consists of a plate, a nail array, a V-groove, a plug plate, a notch, etc. Perfect for schools, educational displays and collections. An excellent addition to your laboratory equipment.